My baby just started crying when I lay him down to sleep. Separation anxiety??

So about 2 weeks ago my son, Benjamin, started crying when I lay down with him to go to sleep. We are bed sharing so he naps/sleeps in my bed. He does not cry for his sitter when she puts him down to sleep...only me. What in the world is going on?? He is obviously tired, I nurse him, then he cries and cries. Is this some sort of separation anxiety?? Really I am the ONLY one he cries for like that. I was thinking maybe he just loves his mama so much he never wants to be away from me....not even to sleep. LOL